MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1267 Mcqs, each offering curated multiple-choice questions to sharpen your Embedded Systems knowledge and support exam preparation. Choose a topic below to get started.
| 801. |
Dark rounded indications with rather smooth edges appear on the radiograph of castingmade in sand mould. These indications would be interpreted as: |
| A. | Slag inclusions |
| B. | Misrun |
| C. | Shrinkage |
| D. | Gas holes |
| Answer» E. | |
| 802. |
A prod method would be most sensitive to cracks: |
| A. | Parallel to a line connecting the prod contact points |
| B. | Tangential to a radius from each prod contact point |
| C. | Perpendicular to a line connecting the prod contact points |
| D. | Perpendicular to the long axis of the coil |
| Answer» B. Tangential to a radius from each prod contact point | |
| 803. |
Echo amplitude losses may be caused by: |
| A. | Entry surface roughness |
| B. | Coarse grain size |
| C. | Discontinuity orientation |
| D. | All of the above |
| Answer» E. | |
| 804. |
A liquid which reacts with a penetrant to render it water washable is called: |
| A. | Developer |
| B. | Emulsifier |
| C. | Aqueous scrubber |
| D. | Non-aqueous cleaner |
| Answer» C. Aqueous scrubber | |
| 805. |
Most contact testing is performed by which of the following techniques? |
| A. | Through transmission |
| B. | Pitch-catch |
| C. | Pulse-echo |
| D. | Continuous wave |
| Answer» D. Continuous wave | |
| 806. |
The most common material used for targets in X ray tubes is: |
| A. | Tungsten |
| B. | Copper |
| C. | Silver |
| D. | Beryllium |
| Answer» B. Copper | |
| 807. |
According to ASTM E709-95 in using prods having a spacing of 19 mm (3/4 inches)and above, the magnetizing current shall be: |
| A. | From 90 to 110 A/25 mm (1 inch) |
| B. | From 100 to 125 A/25 mm (1 inch) |
| C. | From 90 to 120 A/ 25 mm (1 inch) |
| D. | From 100 to 200 A/25 mm (1 inch) |
| Answer» C. From 90 to 120 A/ 25 mm (1 inch) | |
| 808. |
During immersion testing of pipe or tubing the incident longitudinal wave angle mustbe limited to a narrow range. The reason for the upper limit is: |
| A. | To avoid complete reflection of ultrasound from the test piece |
| B. | To prevent formation of Rayleigh waves |
| C. | To prevent formation of shear waves |
| D. | To avoid saturating the test piece with ultrasound |
| Answer» B. To prevent formation of Rayleigh waves | |
| 809. |
What is the preferred pre-cleaning process for removal of oil and grease : |
| A. | Steam cleaning with a added acid |
| B. | Vapour degreasing |
| C. | Steam cleaning |
| D. | Ultrasonic cleaning |
| Answer» C. Steam cleaning | |
| 810. |
Calculate the refracted shear wave angle in steel [VS = 0.323cm/microsec] for anincident longitudinal wave of 37.9 degrees in Plexiglas [VL = 0.267cm/microsec] |
| A. | 26 degrees |
| B. | 45 degrees |
| C. | 48 degrees |
| D. | 64 degrees |
| Answer» C. 48 degrees | |
| 811. |
The focal spot size of an X ray machine must be known in order to determine: |
| A. | The geometric unsharpness |
| B. | Kilovoltage peak output |
| C. | Required mA setting |
| D. | Exposure time |
| Answer» B. Kilovoltage peak output | |
| 812. |
A radiographic exposure with 3700 GBq (100 Ci) source of Ir-192 using source to filmdistance of 60 cm results in a radiation intensity of 0.12 Gy/h (11.8 R/h) and a radiographic density of 2.5. The intensity of radiation needed to obtain the same density when the source to film distance is changed to120 cm is: |
| A. | 0.472 Gy/h (47.2R/h) |
| B. | 0.118 Gy/h (11.8 R/h) |
| C. | 0.029 Gy/h (2.9 R/h) |
| D. | 0.236 Gy/h (23.6 R/h) |
| Answer» D. 0.236 Gy/h (23.6 R/h) | |
| 813. |
A A plan view representation of a test piece is produced by which of the following? |
| A. | A scan |
| B. | B scan |
| C. | C scan |
| D. | A time line display |
| Answer» D. A time line display | |
| 814. |
The formula, NI = 45000/(L/D), gives proper magnetising current for a coil, regardlessof coil size as long as: |
| A. | The test piece is not larger than 1/10 the cross sectional area of the coil |
| B. | AC current only is used |
| C. | The test piece essentially fills the coil |
| D. | The test piece is held tightly against the coil |
| Answer» B. AC current only is used | |
| 815. |
Which of the following does not represent a limitation of magnetic particle testing? |
| A. | The type of materials which may be effectively tested |
| B. | The directionality of the magnetic field |
| C. | The need for demagnetization |
| D. | The ability to detect discontinuities filled with foreign material |
| Answer» E. | |
| 816. |
In which magnetizing method is the current passed directly through the part, therebysetting up a magnetic field at right angles to the current flow? |
| A. | Longitudinal magnetization |
| B. | Coil magnetization |
| C. | Central conductor magnetization |
| D. | None of the above |
| Answer» E. | |
| 817. |
In the solvent removable penetrant process, excess penetrant is removed with: |
| A. | A water spray |
| B. | A hydrophilic scrubber |
| C. | A solvent spray |
| D. | Clean, lint free towels slightly moistened with solvent |
| Answer» E. | |
| 818. |
One half value layer of lead for Iridium-192 is approximately: |
| A. | 12 mm |
| B. | 4 mm |
| C. | 2 mm |
| D. | 25 mm |
| Answer» D. 25 mm | |
| 819. |
The most common harmful effect of exposure to black light is: |
| A. | Eyeball fluorescence |
| B. | Burned retinas |
| C. | Skin burns |
| D. | None of the above |
| Answer» B. Burned retinas | |
| 820. |
A reaction which occurs when a radiation beam of 50 keV is partially absorbed by a testpiece would probably be: |
| A. | The Compton effect |
| B. | The photoelectric effect |
| C. | Pair production |
| D. | Any of the above |
| Answer» C. Pair production | |
| 821. |
A reason for using a dual element search unit is: |
| A. | Improving near surface resolution |
| B. | Improving penetration |
| C. | Eliminating wear on the crystal faces |
| D. | None of the above |
| Answer» B. Improving penetration | |
| 822. |
Magnetic particle test indications which are due to cold work can best be removed by: |
| A. | Demagnetisation |
| B. | Using a lower current |
| C. | Re-crystallisation |
| D. | Heat treating |
| Answer» E. | |
| 823. |
The average energy of a T3-170 source is approximately: |
| A. | 60-80 keV |
| B. | 660 keV |
| C. | 400 keV |
| D. | 1.2 MeV |
| Answer» B. 660 keV | |
| 824. |
The most important penetrant test processing time to control is: |
| A. | Penetrant dwell time |
| B. | Emulsifier dwell time |
| C. | Water rinse time |
| D. | Development time |
| Answer» B. Emulsifier dwell time | |
| 825. |
The purpose of the couplant is to: |
| A. | Match impedances between the transducer and test piece |
| B. | Absorb stray reflectors |
| C. | Clean the test piece so a more efficient test may be continued |
| D. | Lock the ultrasonic scanner into place prior to testing |
| Answer» B. Absorb stray reflectors | |
| 826. |
When a magnetic field is induced in a part with prods spaced 150mm apart, the fieldis: |
| A. | Solenoidal |
| B. | Circular |
| C. | Longitudinal |
| D. | Distorted trapezoidal |
| Answer» C. Longitudinal | |
| 827. |
According to ASTM E709-95 when fluorescent particles are used, the bulb shall bewarmed up prior to use for at least: |
| A. | 1 min |
| B. | 2 min |
| C. | 3 min |
| D. | 4 min |
| Answer» E. | |
| 828. |
An advantage of AC is that: |
| A. | It is most readily available |
| B. | Equipment can be made lighter |
| C. | It leaves the part demagnetized |
| D. | All of the above |
| Answer» E. | |
| 829. |
The diffusion mechanism is used in the operation of: |
| A. | Solvent removable penetrant |
| B. | Lipophilic emulsifiers |
| C. | Hydrophilic emulsifiers |
| D. | Both b and c |
| Answer» C. Hydrophilic emulsifiers | |
| 830. |
Excess penetrant removal is a two step process with which of the following penetrantmethods? |
| A. | Water washable |
| B. | Post emulsifiable |
| C. | Solvent removable |
| D. | Liquid oxygen applications |
| Answer» C. Solvent removable | |
| 831. |
A bar that is 5 cm (2 inches) by 10 cm (4 inches) by 30.5 cm (12 inches) is being magnetized in the circular direction. About how many amperes are required using the perimeter approach? |
| A. | 2200 |
| B. | 4500 |
| C. | 3800 |
| D. | None of the above |
| Answer» D. None of the above | |
| 832. |
Which of the following is not an advantage of a focused transducer? |
| A. | High sensitivity to small flaws |
| B. | Deep penetration |
| C. | High resolving power |
| D. | Not much affected by surface roughness |
| Answer» C. High resolving power | |
| 833. |
An ultrasonic instrument control which allows moving an A scan display to the left orright without changing the distance between any echoes displayed is called: |
| A. | The sweep length or range control |
| B. | The damping control |
| C. | The sweep delay |
| D. | The pulse length control |
| Answer» D. The pulse length control | |
| 834. |
A material with a narrower hysteresis loop has: |
| A. | Higher permeability |
| B. | Lower retentivity |
| C. | Lower coercive force |
| D. | All of the above |
| Answer» E. | |
| 835. |
The fundamental frequency of a piezoelectric crystal is primarily a function of: |
| A. | The length of the applied voltage pulse |
| B. | The amplifying characteristics of the pulse amplifier in the instrument |
| C. | The thickness of the crystal |
| D. | None of the above |
| Answer» D. None of the above | |
| 836. |
The amount of radioactivity which corresponds to 3.7 × 1010 disintegrations per secondis called: |
| A. | 0.01 gray (1 rad) |
| B. | 1 Farad |
| C. | 37 GBq (1 curie) |
| D. | 10 mSv (1 roentgen) |
| Answer» D. 10 mSv (1 roentgen) | |
| 837. |
A wire brush should be used for pre-cleaning: |
| A. | When grease and oil must be removed |
| B. | Only as a last resort |
| C. | When rust is to be removed |
| D. | When grinding burrs must be removed |
| Answer» D. When grinding burrs must be removed | |
| 838. |
The most likely cause of loss of performance in a lipophilic emulsifier is: |
| A. | High viscosity |
| B. | Water contamination |
| C. | Phase separation |
| D. | Improper concentration |
| Answer» C. Phase separation | |
| 839. |
A penetrant process in which excess penetrant is removed with an organic solvent iscalled: |
| A. | Solvent removable |
| B. | Water washable |
| C. | Post-emulsified |
| D. | Dual method |
| Answer» B. Water washable | |
| 840. |
A minimum of external poles are produced by what type of magnetisation? |
| A. | Continuous |
| B. | Residual |
| C. | Circular |
| D. | Longitudinal |
| Answer» D. Longitudinal | |
| 841. |
Compared to the echo returned from a smooth reflector, the echo returned from anatural flaw of the same area and orientation is: |
| A. | The same |
| B. | Greater |
| C. | Smaller |
| D. | Not related to |
| Answer» D. Not related to | |
| 842. |
Which technique would most likely be used to examine a weld, with the weld cap stillin place? |
| A. | Through transmission testing |
| B. | Angle beam testing |
| C. | Straight beam testing |
| D. | None of the above |
| Answer» C. Straight beam testing | |
| 843. |
Radiographic enlargement to distinguish small defects is possible: |
| A. | Only with a very small source or focal spot size radiation source |
| B. | Routinely |
| C. | With most sources |
| D. | Never |
| Answer» B. Routinely | |
| 844. |
An ultrasonic technique in which two transducers are used, in a constant positionrelative to each other, is: |
| A. | Through transmission |
| B. | Contact testing |
| C. | Pulse echo |
| D. | Continuous wave |
| Answer» B. Contact testing | |
| 845. |
Source-to-object distance, object-to-film distance, and source size are the three factorsthat control the of the radiograph. |
| A. | Density |
| B. | Exposure |
| C. | Film size |
| D. | Unsharpness |
| Answer» E. | |
| 846. |
Resolving power of a transducer is directly proportional to its: |
| A. | Wavelength |
| B. | Crystal thickness |
| C. | Bandwidth |
| D. | Q |
| Answer» D. Q | |
| 847. |
When a small diameter tube is placed in a glass of water, water rises in the tube to alevel above the adjacent surface. This is called: |
| A. | Viscosity |
| B. | Capillary action |
| C. | Surface tension |
| D. | Barometric testing |
| Answer» C. Surface tension | |
| 848. |
A radiographic indication in a weld, characterised by two parallel dark lines in the filmimage, would probably be caused by: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Slag inclusions |
| D. | Tungsten inclusions |
| Answer» C. Slag inclusions | |
| 849. |
The most effective NDT method for locating surface cracks in ferromagnetic materials is: |
| A. | Ultrasonic testing |
| B. | Radiographic testing |
| C. | Magnetic particles testing |
| D. | Liquid penetrant testing |
| Answer» D. Liquid penetrant testing | |
| 850. |
Which type of developer does not (!) provide a contrasting background against whichto view penetrant indications? |
| A. | Dry |
| B. | Non-aqueous wet |
| C. | Water soluble |
| D. | Water suspendable |
| Answer» B. Non-aqueous wet | |